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| • An array is an indexed collection of data values. • Data values in an array are called array elements. • Individual elements in an array are accessed by the indexed expression. • Array elements can be values of primitive data type or objects. • In Java, an array can include only elements of the same data type. • AJava array is a reference data type. • AJava array is created with the new operator. • An array can have multiple indices. • When an array is passed to a method as an argument, only a reference to an array is passed. A copy of an array is not created. Note: The reference to an array we are passing is a value of an array variable, and therefore the call-by-value scheme is used here also. • The standard classes and interfaces described or used in this chapter are: List Iterator ArrayList Map LinkedList HashMap TreeMap • The Java Collection Framework includes many data structure classes such as lists and maps. • The List interface represents a linear ordered collection of objects. • The ArrayList and LinkedList classes are two implementations of the List interface. • The Map interface represents a collection of key–value pairs. • The TreeMap and HashMap classes are two implementations of the Map interface. |